From c8ddccfc55c73140b301400d1bee7f8a39b50eab Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop+git@gmail.com>
Date: Fri, 15 Apr 2011 09:26:03 -0400
Subject: [PATCH] initial sdl-opengl-vbo attempt

---
 sdl-opengl-vbo/Makefile          | 10 ++++
 sdl-opengl-vbo/SConstruct        |  6 +++
 sdl-opengl-vbo/sdl-opengl-vbo.cc | 87 ++++++++++++++++++++++++++++++++
 3 files changed, 103 insertions(+)
 create mode 100644 sdl-opengl-vbo/Makefile
 create mode 100644 sdl-opengl-vbo/SConstruct
 create mode 100644 sdl-opengl-vbo/sdl-opengl-vbo.cc

diff --git a/sdl-opengl-vbo/Makefile b/sdl-opengl-vbo/Makefile
new file mode 100644
index 0000000..c5213ff
--- /dev/null
+++ b/sdl-opengl-vbo/Makefile
@@ -0,0 +1,10 @@
+export SCONSFLAGS := -Q
+
+all:
+	@scons
+
+install:
+	@scons $@
+
+clean:
+	@scons -c
diff --git a/sdl-opengl-vbo/SConstruct b/sdl-opengl-vbo/SConstruct
new file mode 100644
index 0000000..940c134
--- /dev/null
+++ b/sdl-opengl-vbo/SConstruct
@@ -0,0 +1,6 @@
+# vim:filetype=python
+
+env = Environment(LIBS = ['GL', 'GLU'], CFLAGS = ['-O2'])
+env.ParseConfig('sdl-config --cflags --libs')
+
+env.Program('sdl-opengl-vbo', Glob('*.cc'))
diff --git a/sdl-opengl-vbo/sdl-opengl-vbo.cc b/sdl-opengl-vbo/sdl-opengl-vbo.cc
new file mode 100644
index 0000000..14447e9
--- /dev/null
+++ b/sdl-opengl-vbo/sdl-opengl-vbo.cc
@@ -0,0 +1,87 @@
+
+#define GL_GLEXT_PROTOTYPES
+#include <SDL/SDL.h>
+#include <GL/gl.h>
+#include <GL/glu.h>
+
+#define WIDTH   500
+#define HEIGHT  500
+
+#define ADDR_DIFF(x, y) ((unsigned long) (y) - (unsigned long) (x))
+
+void init(void)
+{
+    glClearColor (0.0, 0.0, 0.0, 0.0);
+    glEnable(GL_DEPTH_TEST);
+    glShadeModel(GL_SMOOTH);
+    glViewport(0, 0, WIDTH, HEIGHT);
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    gluPerspective(60.0, (GLfloat)WIDTH/(GLfloat)WIDTH, 1.0, 30.0);
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+    glTranslatef(0.0, 0.0, -3.6);
+}
+
+void display(void)
+{
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    static const GLfloat data[][2][4] = {
+        {{-0.8, -0.8, 0.0, 1.0}, {1.0, 0.0, 0.0, 1.0}},
+        {{0.8, -0.8, 0.0, 1.0}, {0.0, 1.0, 0.0, 1.0}},
+        {{0.8, 0.8, 0.0, 1.0}, {0.0, 0.0, 1.0, 1.0}},
+        {{-0.8, 0.8, 0.0, 1.0}, {0.0, 0.4, 1.0, 1.0}}
+    };
+    static const GLbyte indexes[] = {1, 0, 2, 3};
+    GLuint buffers[2];
+    glGenBuffers(sizeof(buffers)/sizeof(buffers[0]), buffers);
+    glBindBuffer(GL_ARRAY_BUFFER, buffers[0]);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(data), data, GL_STATIC_DRAW);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffers[1]);
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indexes), indexes,
+            GL_STATIC_DRAW);
+
+    glBindBuffer(GL_ARRAY_BUFFER, buffers[0]);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffers[1]);
+    glVertexPointer(3, GL_FLOAT, ADDR_DIFF(&data[0], &data[1]),
+            (void *) ADDR_DIFF(&data, &data[0][0][0]));
+    glColorPointer(4, GL_FLOAT, ADDR_DIFF(&data[0], &data[1]),
+            (void *) ADDR_DIFF(&data, &data[0][1][0]));
+    glDrawElements(GL_TRIANGLE_STRIP, 4, GL_UNSIGNED_BYTE, NULL);
+    SDL_GL_SwapBuffers();
+}
+
+int main(int argc, char *argv[])
+{
+    if (SDL_Init(SDL_INIT_VIDEO))
+    {
+        printf("Failed to initialize SDL!\n");
+        return 1;
+    }
+
+    atexit(SDL_Quit);
+
+    SDL_Surface *screen;
+    SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
+    if (!(screen = SDL_SetVideoMode(WIDTH, HEIGHT, 16, SDL_OPENGL)))
+    {
+        printf("Failed to set video mode!\n");
+        SDL_Quit();
+        return 2;
+    }
+    SDL_WM_SetCaption(argv[0], argv[0]);
+
+    init();
+    display();
+    SDL_Event event;
+    while (SDL_WaitEvent(&event))
+    {
+        if (event.type == SDL_QUIT)
+            break;
+        else if (event.type == SDL_KEYDOWN)
+        {
+            if (event.key.keysym.sym == SDLK_ESCAPE)
+                break;
+        }
+    }
+}